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/*
 * Copyright (C) 2018  Sun.Hao
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */

package lodsve.core.utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;

/**
 * 时间的工具类
 *
 * @author sunhao([email protected])
 * @see org.apache.commons.lang.time.DateUtils
 */
public final class DateUtils extends org.apache.commons.lang.time.DateUtils {

    /**
     * 私有化构造器
     */
    private DateUtils() {
    }

    /**
     * Default date formate pattern.
     */
    public static final String DEFAULT_PATTERN = "yyyy-MM-dd HH:mm:ss";

    /**
     * 把字符串转成日期型
     *
     * @param date
     * @param pattern
     * @return
     */
    public static Date parseDate(final String date, final String pattern) {
        if (StringUtils.isEmpty(date)) {
            return null;
        }
        String pat = pattern;
        if (StringUtils.isEmpty(pat)) {
            pat = DEFAULT_PATTERN;
        }
        try {
            return new SimpleDateFormat(pat).parse(date);
        } catch (ParseException e) {
            return null;
        }
    }

    /**
     * 将日期型转成字符串型
     *
     * @param date
     * @param pattern
     * @return
     */
    public static String formatDate(Date date, String pattern) {
        if (StringUtils.isEmpty(pattern)) {
            pattern = DEFAULT_PATTERN;
        }

        return new SimpleDateFormat(pattern).format(date);
    }

    /**
     * 获取给定时间的那天的最后时刻
     *
     * @param day 给定时间(em.2011-01-25 22:11:00...)
     * @return 给定时间的那天的最后时刻(em.2011-01-25 23:59:59...)
     */
    public static Date getEndOfDay(Date day) {
        if (day == null) {
            day = new Date();
        }
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(day);
        calendar.set(Calendar.HOUR_OF_DAY, calendar.getMaximum(Calendar.HOUR_OF_DAY));
        calendar.set(Calendar.MINUTE, calendar.getMaximum(Calendar.MINUTE));
        calendar.set(Calendar.SECOND, calendar.getMaximum(Calendar.SECOND));
        calendar.set(Calendar.MILLISECOND, calendar.getMaximum(Calendar.MILLISECOND));

        return calendar.getTime();
    }

    /**
     * 获取给定时间的那天的开始时刻
     *
     * @param day 给定时间(em.2011-01-25 22:11:00...)
     * @return 给定时间的那天的最后时刻(em.2011-01-25 00:00:00...)
     */
    public static Date getStartOfDay(Date day) {
        if (day == null) {
            day = new Date();
        }
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(day);
        calendar.set(Calendar.HOUR_OF_DAY, calendar.getMinimum(Calendar.HOUR_OF_DAY));
        calendar.set(Calendar.MINUTE, calendar.getMinimum(Calendar.MINUTE));
        calendar.set(Calendar.SECOND, calendar.getMinimum(Calendar.SECOND));
        calendar.set(Calendar.MILLISECOND, calendar.getMinimum(Calendar.MILLISECOND));

        return calendar.getTime();
    }

    /**
     * 获取给定时间的那个月的最后时刻
     *
     * @param day 给定时间(em.2011-01-25 22:11:00...)
     * @return 给定时间的那个月的最后时刻(em.2011-01-31 23:59:59...)
     */
    public static Date getEndOfMonth(Date day) {
        if (day == null) {
            day = new Date();
        }

        Calendar calendar = Calendar.getInstance();
        calendar.setTime(day);

        calendar.set(Calendar.HOUR_OF_DAY, calendar.getMaximum(Calendar.HOUR_OF_DAY));
        calendar.set(Calendar.MINUTE, calendar.getMaximum(Calendar.MINUTE));
        calendar.set(Calendar.SECOND, calendar.getMaximum(Calendar.SECOND));
        calendar.set(Calendar.MILLISECOND, calendar.getMaximum(Calendar.MILLISECOND));

        calendar.set(Calendar.DAY_OF_MONTH, 1);

        calendar.add(Calendar.MONTH, 1);

        calendar.add(Calendar.DAY_OF_MONTH, -1);

        return calendar.getTime();
    }

    /**
     * 获取给定时间的那个月的开始时刻
     *
     * @param day 给定时间(em.2011-01-25 22:11:00...)
     * @return 给定时间的那个月的开始时刻(em.2011-01-01 00:00:00...)
     */
    public static Date getStartOfMonth(Date day) {
        if (day == null) {
            day = new Date();
        }

        Calendar calendar = Calendar.getInstance();
        calendar.setTime(day);

        calendar.set(Calendar.HOUR_OF_DAY, calendar.getMinimum(Calendar.HOUR_OF_DAY));
        calendar.set(Calendar.MINUTE, calendar.getMinimum(Calendar.MINUTE));
        calendar.set(Calendar.SECOND, calendar.getMinimum(Calendar.SECOND));
        calendar.set(Calendar.MILLISECOND, calendar.getMinimum(Calendar.MILLISECOND));

        calendar.set(Calendar.DAY_OF_MONTH, 1);

        return calendar.getTime();
    }

    /**
     * 获取给定时间的那天的正午时刻
     *
     * @param day 给定时间(em.2011-01-25 22:11:00...)
     * @return 给定时间的那天的最后时刻(em.2011-01-25 12:00:00...)
     */
    public static Date getNoonOfDay(Date day) {
        if (day == null) {
            day = new Date();
        }

        Calendar calendar = Calendar.getInstance();
        calendar.setTime(day);
        calendar.set(Calendar.HOUR_OF_DAY, 12);
        calendar.set(Calendar.MINUTE, calendar.getMinimum(Calendar.MINUTE));
        calendar.set(Calendar.SECOND, calendar.getMinimum(Calendar.SECOND));
        calendar.set(Calendar.MILLISECOND, calendar.getMinimum(Calendar.MILLISECOND));
        return calendar.getTime();
    }

    /**
     * 获取当前时间
     *
     * @return
     */
    public static Date getNow() {
        return new Date();
    }

    /**
     * 获取给定日期的星期数
     *
     * @param prefix 前缀			ep.'星期'
     * @param date   给定日期			eg.'2012-01-25 23:07:58'
     * @return 前缀+(星期数)	ep.'星期三'
     */
    public static String getDayOfWeek(String prefix, Date date) {
        final String[] dayNames = {"日", "一", "二", "三", "四", "五", "六"};
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK) - 1;
        if (dayOfWeek < 0) {
            dayOfWeek = 0;
        }

        return prefix + dayNames[dayOfWeek];
    }

    /**
     * 获取给定日期的星期数(默认前缀:'星期')
     *
     * @param date
     * @return
     */
    public static String getDayOfWeek(Date date) {
        return getDayOfWeek("星期", date);
    }

    /**
     * 获取当前日历所属的年.
     *
     * @return 当前日历所属的年.
     */
    public static int getCurrentYear() {
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        return calendar.get(Calendar.YEAR);
    }

    /**
     * 获取当前日历所属的月，月份是从1开始的.
     *
     * @return 当前日历所属的月.
     */
    public static int getCurrentMonth() {
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        return calendar.get(Calendar.MONTH) + 1;
    }

    /**
     * 获取间隔给定天数的日期 

     *
     * @param date 给定的日期(eg:2015-06-02 12:00)
     * @param days 间隔的天数，正数是给定时间往后，负数是给定时间往前(eg:-1 or 1)
     * @return 计算出来的日期(eg:2015-06-01 12:00 or 2015-06-03 12:00)

     */
    public static Date intervalSomeDays(Date date, int days) {
        if (date == null) {
            return date;
        }

        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        cal.set(Calendar.DAY_OF_YEAR, cal.get(Calendar.DAY_OF_YEAR) + days);

        return cal.getTime();
    }

    /**
     * 获取间隔给定月数的日期 

     *
     * @param date   给定的日期(eg:2015-06-02 12:00)
     * @param months 间隔的月数，正数是给定时间往后，负数是给定时间往前(eg:-1 or 1)
     * @return 计算出来的日期(eg:2015-05-02 12:00 or 2015-07-02 12:00)

     */
    public static Date intervalSomeMonths(Date date, int months) {
        if (date == null) {
            return date;
        }

        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        cal.set(Calendar.MONTH, cal.get(Calendar.MONTH) + months);

        return cal.getTime();
    }

    /**
     * 获取间隔给定月数的日期 

     *
     * @param date  给定的日期(eg:2015-06-02 12:00)
     * @param years 间隔的月数，正数是给定时间往后，负数是给定时间往前(eg:-1 or 1)
     * @return 计算出来的日期(eg:2014-06-02 12:00 or 2016-06-02 12:00)

     */
    public static Date intervalSomeYears(Date date, int years) {
        if (date == null) {
            return date;
        }

        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        cal.set(Calendar.YEAR, cal.get(Calendar.YEAR) + years);

        return cal.getTime();
    }
}




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